Improvement in machines ror dressing millstones



UNITED STATES JOHN I. YOUNT, OF TIPPEOANOE CITY, OHIO.

IMPROVEMENT IN MACHINES ROR DRESSlNG MILLSTONES.

Specification forming part of Letters Patent No. 119,551, dated October3, 1871.

To all whom it may concern:

Be it known that I, JOHN I. YoUNr, of Tippecanoe City, in the county ofMiami and State of Ohio, have invented an Improvement in Machines forDressing Millstones, of which the following is a specification:

This invention relates to a machine for facing, furrowing, and crackingmillstones; and my improvements consist: First, in the employment ofoscillating picks, to which a horizontal reciproeating motion isimparted at the same time that the length of their arcs of oscillationis gradually changed during each horizontal stroke, whereby the picksare caused to cut an inclined furrow. Second, in providing means forholding the bar which regulates the length of the arc of oscillation ofthe picks stationary to adapt the machine for facing the stone, and alsofor cracking the land by providing a suitable feed mechanism. Third, inthe details of mechanism to be generally explained in the followingdescription and specificallypointed out in the claims.

Figure 1 represents a side elevation of my improved machine. Fig. 2 isalso a side elevation, illustrating the opposite side. Fig. 3 is a frontelevation. Fig. 4 is also a front elevation, the picks being removed toshow the lifting mechanism. Fig. 5 is a bottom view. Fig. 6 is a sectionof apick and its socket detached.

The same letters of reference are employed in all the figures in thedesignation of identicalparts.

All the operative parts of the machine are mounted upon a suitable frame-work, A, open at the forward end to let the picks B protrude and allowthem to go through their compound movements without obstruction.Thepicks are secured to sockets B constructed, by preference, as shownin Fig. 6, where the pick enters a socket, 12, and is secured to asetscrew, b, so that its point or edge may be readily adjusted to bringit in line with the edges of the other picks. The sockets are secured tothe long handles B which, extending to the rear end of the frame, arepivoted upon a shaft passing horizontally through the carrier-block O. Amortise is cut trans Versely through this block for each pick-handle ofsufficient height to permit the necessary vibrations of the handles, andthe latter are further connected to the block 0 by flat springs, shownin broken lines in Figs. 1 and 2, which accumulate force as the picksare raised and aid in giving the blow. The picks are oscillated by acompound crank-shaft, D, journaled at each end in suitable boxes on theside timbers of the frame beneath the pick-handles, the crank-shaftbeing revolved, by a spur-wheel, E upon a countershaft, E, idle-wheel, Eand pinion, D, as best seen in Fig. 1. The power is applied to the crankE on the counter-shaft E. Each crank of the shaft D operates one pick,and the cranks are so disposed with relation to one another that thepicks will strike the blows in two sets and in alternation. Any otherarrangement may, 110wever, be adopted. The carrier-block O is firmlyconnected, by bars 0 c, to a cross-head, F, which, projecting at eachend through the side timbers of the frame-work, slides in suitableguides F secured therein, as shown in Figs. 1 and 2. At the overhungends the cross-head is attached, by a slip-joint, to the short arms ofthe oscillating levers G G, which are fulcrumed upon the studs 9 grespectively, and have in their long arms a series of holes, 9 to one orthe other of which the wrist-pins of pitmen H H are hitched. Thesepitmen are connected at the other end to cranks H on the overhung endsof a transverse shaft, I, which carries a large spur-wheel, I and isrevolved through the mediinn of the latter and a pinion, E on thedriving-shaft E. The length of the stroke of the crosshead F andcarrierblock 0 may readily be changed by changing the attachment of thepitmen to the oscillating levers from one to another of the series ofholes g While the mechanism above described for imparting areciprocating motion to the carrierblock is deemed preferable, yet othermeans which will readily suggest themselves to a practical mechanic maybe employed to obtain this result. The shaft I is cranked at I and I andat those points rods K and K are suspended from it which carry at theirlower ends a transverse horizontal bar, L. The cranks I and I are soarranged with relation to the cranks H and carrier-block G that when thelatter completes a stroke the cranks I and I will stand vertically belowor above, as the case may be, the axis of the shaft I. To the ends ofthe bar L the oscillating levers L and L are detachably connected,which, extending forward, turn upon studs 1 l secured to verticalslide-r0 ds M and M. The short arms of these levers are connected by astay-rod, L passing from one to the other beneath the Improvement inLatches for Gates and Doors .No. 119,552. v Patented 001 3, 1871.

